Smoke detector certification device and calibration method based on laser light scattering measurement principle

Abstract

The invention provides a smoke detector certification device based on a laser light scattering measurement principle. The smoke detector calibrating device comprises a certification instrument and a calibration instrument, wherein the certification instrument comprises a certification instrument processing circuit, a measurement cavity 14 and a first photoelectric sensor 13, the measurement cavity is provided with a first transparent window 20 and a second transparent window 21, and the calibrationinstrument comprises a second photoelectric sensor 17 and a trigger 18; a measurement beam 23 is incident from the first transparent window and exits from the second transparent window; the first photoelectric sensor 13 is used for detecting the light intensity of a scattered beam formed in a way that the detected smoke is scattered; the second photoelectric sensor 17 is used for detecting the light intensity of a transmitted beam which is formed by passing through the detected smoke and exits from the second transparent window; the trigger is used for synchronously triggering the first photoelectric sensor and the second photoelectric sensor. According to the smoke detector certification device, a calibration scheme of synchronously triggering the first photoelectric sensor and the second photoelectric sensor at high speed is adopted, so that the difficulty of no standard smoke sample is solved.

Description

technical field [0001] The invention relates to a verification device of a smoke detector, in particular to a verification device and a calibration method of a smoke detector based on the principle of laser scattering measurement. Background technique [0002] For different types and different stages of fires, the sensing technologies that have been widely used include: gas-sensitive sensing of combustible gas components released by fires, infrared-type detection of heat sources of fires, ultraviolet-type detection of ultraviolet light associated with fires, and ion-type sensing The interference of fire smoke particles on the electric ion field, the photoelectric type measures the particle concentration of fire smoke or the shielding effect of smoke particles on light (hereinafter collectively referred to as particle type). Mine smoke sensor is an important equipment for mine safety production monitoring and monitoring. With the continuous improvement of technical level, its...

AI Technical Summary

Problems solved by technology

[0003] In the past, the mine smoke sensor detection standard required the detection of the smoke mass concentration. Its disadvantages were poor real-time performance, large measurement errors in mass concentration and response time, and difficulty in controlling the smoke mass concentration during the detection process.

Restricted by the detection equipment, currently only the alarm triggering of the smoke sensor at a certain concentration threshold is evaluated, and the verification of any smoke concentration in the full range cannot be completed, nor can the legal metrology traceability be completed through the verification benchmarks of other industries

Images